into an environment like this, first, you want to say am i indoors, outdoor, this is an outdoor event. where am i standing? are there trash cans near me? is there a mailbox near me? that can be a someplace where somebody can conceal a device. don't stand there. is there glass around me? get away from that, if stand near a structure that's concrete, steel, brick. even if it's from a distance, the blast wave can shatter all that glass. >> do you need to be thinking about that? >> it's such a weird thing to think about. >> on a day when you're celebrating, you're not thinking about this. >> you should think about this all the time. wherever you go. whether it's a movie theater, the school, the mall. >> is it our new reality? and is it going to get worse? >> i think this is reality and i think that you should do this, it takes a few minutes, any place you go, what do i do if this happens. >> what do you think it does to your psyche? there are some people, i get it, you live your life afraid. like oh my god, something bad's around the corner. living your life that way -- >> most of the time it isn't.